<template>
	<view>
		<my-search @click="gotoSearch"> </my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view scroll-y="true"  class="left-scroll-view"  :style="{height: wh + 'px'} ">
			<block v-for="(item , i) in cateList" :key="i">
				<view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
			</block>			
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true"  class="right-scroll-view"  :style="{height: wh + 'px'}" :scroll-top="scrollTop">
			<view class="cate-lv2" v-for="(item2 , i2) in cateLever2" :key="i2">
				<!-- 二级分类的标题 -->
				<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
				<!-- 二级分类下渲染三级分类的列表数据 -->
				<view class="cate-lv3-list">
					<!-- 三级分类item 项 -->
					<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
						<!-- 图片  数据出现问题 使用replace进行分割替换-->
						<image :src="item3.cat_icon.replace('ugo-dev','hmugo-web')" mode="widthFix"></image>
						<!-- 文本   -->
						<text>{{item3.cat_name}}</text>
					</view>	
				</view>
			</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
			   wh : 0,
			   cateList:[],
			   active:0,
			   cateLever2:[],
			   scrollTop:0
			   
			};
		},
		onLoad(){
		 const sysInfo = uni.getSystemInfoSync()
		 // console.log(sysInfo )  获取屏幕可使用高度
		 this.wh = sysInfo.windowHeight - 50
		 this.getCateList()
		 
		},
		methods:{
		async getCateList(){
			const {data : res} = await uni.$http.get('/api/public/v1/categories')
			// console.log(res)
			if(res.meta.status !== 200) return uni.$showMsg()
			this.cateList = res.message
			// 为二级分类赋值
			 this.cateLever2 = res.message[0].children
			},
			activeChange(i){
				this.active = i 
				// 给二级分类赋值
				this.cateLever2 = this.cateList[i].children
				// 将scrollTop重置为0
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			},
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
		.left-scroll-view{
			width: 120px;
			.left-scroll-view-item{
				background-color: #f7f7f7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;
				&.active{
					background-color: #efefef;
					position: relative;
				 &::before{
					 content: ' ';
					 display: block;
					 width: 3px;
					 height: 30px;
					 background-color: #C00000;
					 position: absolute;
					 top: 50%;
					 left: 0;
					 transform: translateY(-50%);
				    }
				}
			}
		}
		
    }
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lv3-list{
		display: flex;
		// 放不下自动换行
		flex-wrap: wrap;
		
		
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			// 横向和纵向居中
			justify-content: center;
			align-items: center;
			
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 12px;
			}
		}
	}
	

</style>
